Description

outputColNames CAN NOT have the same colName with keepOriginColName except the selectedColName.

Parameters

Name Description Type Required？ Default Value
selectedCols Names of the columns used for processing String[] ✓
outputCols Names of the output columns String[] ✓
reservedCols Names of the columns to be retained in the output table String[] null

Script Example

Code

  1. source = CsvSourceStreamOp()\
  2.     .setSchemaStr("sepal_length double, sepal_width double, petal_length double, petal_width double, category string")\
  3.     .setFilePath("https://alink-release.oss-cn-beijing.aliyuncs.com/data-files/iris.csv")
  5. udtfOp = UDTFStreamOp()\
  6.     .setFunc(lambda x, y: [ (yield x + 1 + i, y + 2 + i) for i in range(3) ])\
  7.     .setResultTypes(["DOUBLE", "DOUBLE"])\
  8.     .setSelectedCols(['sepal_length', 'sepal_width'])\
  9.     .setOutputCols(['index', 'x'])\
  10.     .setReservedCols(['sepal_length', 'sepal_width'])
  11. res = udtfOp.linkFrom(source)
  12. res.print()
  14. StreamOperator.execute()

Results

  1.   sepal_length sepal_width index    x
  2. 1          5.2         4.1   6.2  6.1
  3. 2          5.2         4.1   7.2  7.1
  4. 3          5.2         4.1   8.2  8.1
  5. 4          5.5         2.6   6.5  4.6
  6. 5          5.5         2.6   7.5  5.6
  7. ...        ...         ...   ...  ...
  8. 96         5.7         4.4   7.7  7.4
  9. 97         5.7         4.4   8.7  8.4
  10. 98         6.5         3.0   7.5  5.0
  11. 99         6.5         3.0   8.5  6.0
  12. 100        6.5         3.0   9.5  7.0